AE 6.5 - Keylight - Flickering

[Can Scanner]

I'm doing some compositing in AE 6.5 Pro with Keylight, and when I frame-advance or render/export, it flickers; every other frame or so is the original greenscreen clip as though Keylight were never applied.

Here's how I have my composition set up:
I'm making the bed of a truck look really big.
I have a shot of the bed. (I put the camera in the bed and shot straight out of the back of the truck, with the bed door down.)
On top of this, I have a greenscreen shot of two people.
I've applied Keylight to the greenscreen shot, and then scaled it down so the people appear very small, peeking over and looking into the truck bed.

But only half of this composition is good- every other frame or so simply shows the original full-size greenscreen shot (prior to applying Keylight and scaling), with no sign of the truck bed shot, and with the SCALED-DOWN greenscreen shot ON TOP! It looks like a flickering mess!

I'm using 720p 24p footage from the Panasonic HVX200 that has been converted with CineForm Aspect HD with the CineForm intermediate codec (which I've used plenty of times without error.)

Composition is 23.976 fps, and the clips are 23.98. (Again, I've used these settings before and they worked fine!)

Is there some tiny setting I'm overlooking?

Thanks in advance!

EDIT: I've been working with some new compositions with different effects (masks, luma keys, rotation, scale, etc), with up to three layers. It seems to be shifting the effects among different layers, every other frame. It's a complete mess. This is really weird.

[milksac]

I can't really help with the 720/24p suff because I've never worked with it. But I think it work help others in figuring out your problem if you posted some more info. How is the footage being interpreted? What are your render settings?

"every other frame or so is the original greenscreen clip..."
This sounds like an issue with cadence.

[Can Scanner]

The footage is all 1280x720 pixels, square, progressive (no frames) at 23.98fps.
Here's a quick video of the mess (http://www.greatmindspro.com/movies/AEflicker/TruckBedGreenScreen.wmv) I'm dealing with.
It's like AE is randomly switching and swapping effects and settings around to different layers.

Here are my render settings:
http://www.greatmindspro.com/movies/AEflicker/rendersettings.jpg

Here is what the comp is supposed to look like:
http://www.greatmindspro.com/movies/AEflicker/Comp%201%20(0-00-21-03).jpg

[SomewhereinLA]

Not sure that it will help with your particular problem, but try turning Open GL off, and see if it helps....

[Can Scanner]

Not sure that it will help with your particular problem, but try turning Open GL off, and see if it helps....
Nope, no good.
Good suggestion though. I also tried every combination of the preview options in the Comp window: Off, Adaptive Res, Open GL with Moving Textures, etc.

[SomewhereinLA]

Here are other suggestions: Did you render a test with keylight off? Did you try to re-key your clip? Did you look at you keyframes to make sure you didn't add a "bad" keyframe. Is the z buffer on(in other word are you working in 3d or 2d), it it's on (3d) turn it off ?

[Neil Rowe]

..not to overlook the subtle, are you using a legal registered copy of AE?

[kai]

..not to overlook the subtle, are you using a legal registered copy of AE?


zzzzzzzing!!!!

[ChrisLyon]

Is all the footage you are using progressive 24? If not it may have a problem interpreting field dominance in the interlaced footage. Say, if the people are shot interlaced or some other component is interlaced.

Also, try reinstalling Keylight. It should be on your install disc.

And can you upload a copy of your project file?

[Can Scanner]

Gosh, you guys... YES it's a legal registered copy!
I'll try SomewhereinLA's suggestions tomorrow, and I'll upload the project file too...
Thanks for the help so far everyone.

[Steve_Arm]

I watched the WMV and I think either Cineform codec has freaked out either AE. I've never seen this behavior before. Try switching layers & effects of one by one to narrowed it down.
Although I would reinstall AE.

A layer flickering could occur if you have 3D layers and they all have 0 Z position so both have to show and AE renders them one frame showing one and th other frame showing the other layer.

[Funkycoldg]

I had that problem with Cineform Converted footage in AE but it was only when there were opacity keyframes set. I also have had Keylight keyed footage flicker on me after my system has been on for alittle bit. What version of Cineform do you have? Cineform gave me a .dll file to fix my problem in AE.

[David Newman]

There aren't any known issues due to the CineForm codec in its current release. There was a few months ago an AE issue with the VFW decoder, so do make sure you are running Aspect HD 4.3.x, (or PHD 2.3.x and CHD 3.4.x.)

The second issue is 23.98 vs 23.976 this is a bug in the AE VFW importer, so all AVI compressors have this issue. The frame rate error is an issue for some effect operations. You can address this in two ways, 1) interpret all footage to 23.976 2) activate the CineForm AE importer (with Prospect HD uses.) If you want to do this I can get you the registry key (but get over your glitch first -- i.e. confirm that a new decoder and/or interpret footage fixes things.)

[Can Scanner]

I just installed the update for Aspect HD (a legal registered copy!), and that fixed it!
Thanks everyone.